Development of Estheria Packardi. 



Pl. IV. 



Fig. 1. Shell of a young Estheria in the 6th postlarval stage, 



with 5 lines of growth, viewed from left side; 



X 42. 

 » 2. Shell of another specimen in the 9th postlarval 



stage, with 8 lines of growth, viewed from leftside; 



X 32. 

 » 3. Fully grown female, drawn from life, and viewed 



from left side, magnified about 10 diameters. 

 » 4. Same, dorsal view. 



